Flutter:关闭后退应用程序不起作用

时间:2019-02-06 05:50:53

标签: android dart flutter

在应用程序中,启动后出现启动屏幕,然后我到达登录屏幕,该屏幕上没有应用程序栏或后退按钮,但我可以从设备后退按钮后退。当我从登录屏幕按下背面时,我不想回到初始屏幕。我尝试了许多解决方案,但是它们无法正常工作。

class Login extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'xyz',
      home: LoginPage(),
      debugShowCheckedModeBanner: false,

    );
  }
}


class LoginPage extends StatefulWidget {

  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
        onWillPop: () {
          if (Navigator.canPop(context)) {
            Navigator.pop(context);  // i tried both the way
            Navigator.of(context).pop();
          } else {
            SystemNavigator.pop();
          }
        }, 
        child:Scaffold(
      body: Container(.........................//here is my desiging stuff

我还尝试了return Future.value(false);的真假值–

启动画面代码

 @override
  void initState (){
    super.initState();
    // TODO initial state stuff
    new Future.delayed(
        const Duration(seconds: 2),
            () => Navigator.push(
          context,
          MaterialPageRoute(builder: (context) => Login()),
        ));
  }

3 个答案:

答案 0 :(得分:0)

只需将空函数传递给-WillPopScope小部件。

class LoginPage extends StatefulWidget {
  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
        onWillPop: () {},   // Empty Function.
        child: Scaffold(
          body: Container(), //here is my desiging stuff
        ));
  }
}

OR

@override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        return false;
      },
      child: Scaffold(
        body: Container(),
        appBar: AppBar(),
      ),
    );
  }

如果您不想转到启动画面。

最好使用:

Navigator.of(context)
                    .pushReplacement(MaterialPageRoute(builder: (context) => Login()));

答案 1 :(得分:0)

只需将代码更改为:

class _LoginPageState extends State<LoginPage> {

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
        onWillPop: ()async => false,
        child:Scaffold(
      body: Container(.........................//here is my desiging stuff

答案 2 :(得分:0)

我遇到了同样的问题,这是因为错误地用MaterialApp包围了WillPopScope(而不是包围了Scaffold)。

感谢@ anmol-majhail,这是我的正确解决方案:

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Fetch Data Example',
      home: WillPopScope(
          child: Scaffold(...),
          onWillPop: () async {
            return false;
          }),
    );
  }